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Insurance Activity - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Mar. 19, 2012
Aug. 31, 2009
Effects of Reinsurance [Line Items]        
Quoted percentage to share base       50.00%
Balances in the fair market reserve $ 46,300,000 $ 52,200,000    
Loss contract fair market reserve     63,100,000  
Decreased value of fair market reserve $ 5,900,000 $ 10,900,000    
WMMRC [Member]
        
Effects of Reinsurance [Line Items]        
Second loss layer risk percentage of range minimum       5.00%
Second loss layer risk percentage of range maximum       10.00%
First loss layer risk percentage of range minimum       4.00%
First loss layer risk percentage of range maximum       5.00%
Minimum period of reinsurance agreements 5 years      
Maximum period of reinsurance agreements 10 years